nadekobot/NadekoBot.Core/_Extensions/ArrayExtensions.cs

using System;

namespace NadekoBot.Extensions
{
    // made for customreactions because they almost never get added
    // and they get looped through constantly
    public static class ArrayExtensions
    {
        /// <summary>
        /// Create a new array from the old array + new element at the end
        /// </summary>
        /// <param name="input">Input array</param>
        /// <param name="added">Item to add to the end of the output array</param>
        /// <typeparam name="T">Type of the array</typeparam>
        /// <returns>A new array with the new element at the end</returns>
        public static T[] With<T>(this T[] input, T added)
        {
            var newCrs = new T[input.Length + 1];
            Array.Copy(input, 0, newCrs, 0, input.Length);
            newCrs[input.Length] = added;
            return newCrs;
        }
    }
}